1 /*
2 * wm8994-core.c -- Device access for Wolfson WM8994
3 *
4 * Copyright 2009 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/i2c.h>
19 #include <linux/err.h>
20 #include <linux/delay.h>
21 #include <linux/mfd/core.h>
22 #include <linux/of.h>
23 #include <linux/of_device.h>
24 #include <linux/of_gpio.h>
25 #include <linux/pm_runtime.h>
26 #include <linux/regmap.h>
27 #include <linux/regulator/consumer.h>
28 #include <linux/regulator/machine.h>
29
30 #include <linux/mfd/wm8994/core.h>
31 #include <linux/mfd/wm8994/pdata.h>
32 #include <linux/mfd/wm8994/registers.h>
33
34 #include "wm8994.h"
35
36 static const struct mfd_cell wm8994_regulator_devs[] = {
37 {
38 .name = "wm8994-ldo",
39 .id = 0,
40 .pm_runtime_no_callbacks = true,
41 },
42 {
43 .name = "wm8994-ldo",
44 .id = 1,
45 .pm_runtime_no_callbacks = true,
46 },
47 };
48
49 static struct resource wm8994_codec_resources[] = {
50 {
51 .start = WM8994_IRQ_TEMP_SHUT,
52 .end = WM8994_IRQ_TEMP_WARN,
53 .flags = IORESOURCE_IRQ,
54 },
55 };
56
57 static struct resource wm8994_gpio_resources[] = {
58 {
59 .start = WM8994_IRQ_GPIO(1),
60 .end = WM8994_IRQ_GPIO(11),
61 .flags = IORESOURCE_IRQ,
62 },
63 };
64
65 static const struct mfd_cell wm8994_devs[] = {
66 {
67 .name = "wm8994-codec",
68 .num_resources = ARRAY_SIZE(wm8994_codec_resources),
69 .resources = wm8994_codec_resources,
70 },
71
72 {
73 .name = "wm8994-gpio",
74 .num_resources = ARRAY_SIZE(wm8994_gpio_resources),
75 .resources = wm8994_gpio_resources,
76 .pm_runtime_no_callbacks = true,
77 },
78 };
79
80 /*
81 * Supplies for the main bulk of CODEC; the LDO supplies are ignored
82 * and should be handled via the standard regulator API supply
83 * management.
84 */
85 static const char *wm1811_main_supplies[] = {
86 "DBVDD1",
87 "DBVDD2",
88 "DBVDD3",
89 "DCVDD",
90 "AVDD1",
91 "AVDD2",
92 "CPVDD",
93 "SPKVDD1",
94 "SPKVDD2",
95 };
96
97 static const char *wm8994_main_supplies[] = {
98 "DBVDD",
99 "DCVDD",
100 "AVDD1",
101 "AVDD2",
102 "CPVDD",
103 "SPKVDD1",
104 "SPKVDD2",
105 };
106
107 static const char *wm8958_main_supplies[] = {
108 "DBVDD1",
109 "DBVDD2",
110 "DBVDD3",
111 "DCVDD",
112 "AVDD1",
113 "AVDD2",
114 "CPVDD",
115 "SPKVDD1",
116 "SPKVDD2",
117 };
118
119 #ifdef CONFIG_PM
wm8994_suspend(struct device * dev)120 static int wm8994_suspend(struct device *dev)
121 {
122 struct wm8994 *wm8994 = dev_get_drvdata(dev);
123 int ret;
124
125 /* Don't actually go through with the suspend if the CODEC is
126 * still active for accessory detect. */
127 switch (wm8994->type) {
128 case WM8958:
129 case WM1811:
130 ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1);
131 if (ret < 0) {
132 dev_err(dev, "Failed to read power status: %d\n", ret);
133 } else if (ret & WM8958_MICD_ENA) {
134 dev_dbg(dev, "CODEC still active, ignoring suspend\n");
135 return 0;
136 }
137 break;
138 default:
139 break;
140 }
141
142 /* Disable LDO pulldowns while the device is suspended if we
143 * don't know that something will be driving them. */
144 if (!wm8994->ldo_ena_always_driven)
145 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
146 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
147 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD);
148
149 /* Explicitly put the device into reset in case regulators
150 * don't get disabled in order to ensure consistent restart.
151 */
152 wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
153 wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
154
155 regcache_mark_dirty(wm8994->regmap);
156
157 /* Restore GPIO registers to prevent problems with mismatched
158 * pin configurations.
159 */
160 ret = regcache_sync_region(wm8994->regmap, WM8994_GPIO_1,
161 WM8994_GPIO_11);
162 if (ret != 0)
163 dev_err(dev, "Failed to restore GPIO registers: %d\n", ret);
164
165 /* In case one of the GPIOs is used as a wake input. */
166 ret = regcache_sync_region(wm8994->regmap,
167 WM8994_INTERRUPT_STATUS_1_MASK,
168 WM8994_INTERRUPT_STATUS_1_MASK);
169 if (ret != 0)
170 dev_err(dev, "Failed to restore interrupt mask: %d\n", ret);
171
172 regcache_cache_only(wm8994->regmap, true);
173 wm8994->suspended = true;
174
175 ret = regulator_bulk_disable(wm8994->num_supplies,
176 wm8994->supplies);
177 if (ret != 0) {
178 dev_err(dev, "Failed to disable supplies: %d\n", ret);
179 return ret;
180 }
181
182 return 0;
183 }
184
wm8994_resume(struct device * dev)185 static int wm8994_resume(struct device *dev)
186 {
187 struct wm8994 *wm8994 = dev_get_drvdata(dev);
188 int ret;
189
190 /* We may have lied to the PM core about suspending */
191 if (!wm8994->suspended)
192 return 0;
193
194 ret = regulator_bulk_enable(wm8994->num_supplies,
195 wm8994->supplies);
196 if (ret != 0) {
197 dev_err(dev, "Failed to enable supplies: %d\n", ret);
198 return ret;
199 }
200
201 regcache_cache_only(wm8994->regmap, false);
202 ret = regcache_sync(wm8994->regmap);
203 if (ret != 0) {
204 dev_err(dev, "Failed to restore register map: %d\n", ret);
205 goto err_enable;
206 }
207
208 /* Disable LDO pulldowns while the device is active */
209 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
210 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
211 0);
212
213 wm8994->suspended = false;
214
215 return 0;
216
217 err_enable:
218 regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
219
220 return ret;
221 }
222 #endif
223
224 #ifdef CONFIG_REGULATOR
wm8994_ldo_in_use(struct wm8994_pdata * pdata,int ldo)225 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
226 {
227 struct wm8994_ldo_pdata *ldo_pdata;
228
229 if (!pdata)
230 return 0;
231
232 ldo_pdata = &pdata->ldo[ldo];
233
234 if (!ldo_pdata->init_data)
235 return 0;
236
237 return ldo_pdata->init_data->num_consumer_supplies != 0;
238 }
239 #else
wm8994_ldo_in_use(struct wm8994_pdata * pdata,int ldo)240 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
241 {
242 return 0;
243 }
244 #endif
245
246 static const struct reg_sequence wm8994_revc_patch[] = {
247 { 0x102, 0x3 },
248 { 0x56, 0x3 },
249 { 0x817, 0x0 },
250 { 0x102, 0x0 },
251 };
252
253 static const struct reg_sequence wm8958_reva_patch[] = {
254 { 0x102, 0x3 },
255 { 0xcb, 0x81 },
256 { 0x817, 0x0 },
257 { 0x102, 0x0 },
258 };
259
260 static const struct reg_sequence wm1811_reva_patch[] = {
261 { 0x102, 0x3 },
262 { 0x56, 0xc07 },
263 { 0x5d, 0x7e },
264 { 0x5e, 0x0 },
265 { 0x102, 0x0 },
266 };
267
268 #ifdef CONFIG_OF
wm8994_set_pdata_from_of(struct wm8994 * wm8994)269 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
270 {
271 struct device_node *np = wm8994->dev->of_node;
272 struct wm8994_pdata *pdata = &wm8994->pdata;
273 int i;
274
275 if (!np)
276 return 0;
277
278 if (of_property_read_u32_array(np, "wlf,gpio-cfg", pdata->gpio_defaults,
279 ARRAY_SIZE(pdata->gpio_defaults)) >= 0) {
280 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
281 if (wm8994->pdata.gpio_defaults[i] == 0)
282 pdata->gpio_defaults[i]
283 = WM8994_CONFIGURE_GPIO;
284 }
285 }
286
287 of_property_read_u32_array(np, "wlf,micbias-cfg", pdata->micbias,
288 ARRAY_SIZE(pdata->micbias));
289
290 pdata->lineout1_diff = true;
291 pdata->lineout2_diff = true;
292 if (of_find_property(np, "wlf,lineout1-se", NULL))
293 pdata->lineout1_diff = false;
294 if (of_find_property(np, "wlf,lineout2-se", NULL))
295 pdata->lineout2_diff = false;
296
297 if (of_find_property(np, "wlf,lineout1-feedback", NULL))
298 pdata->lineout1fb = true;
299 if (of_find_property(np, "wlf,lineout2-feedback", NULL))
300 pdata->lineout2fb = true;
301
302 if (of_find_property(np, "wlf,ldoena-always-driven", NULL))
303 pdata->lineout2fb = true;
304
305 pdata->ldo[0].enable = of_get_named_gpio(np, "wlf,ldo1ena", 0);
306 if (pdata->ldo[0].enable < 0)
307 pdata->ldo[0].enable = 0;
308
309 pdata->ldo[1].enable = of_get_named_gpio(np, "wlf,ldo2ena", 0);
310 if (pdata->ldo[1].enable < 0)
311 pdata->ldo[1].enable = 0;
312
313 return 0;
314 }
315 #else
wm8994_set_pdata_from_of(struct wm8994 * wm8994)316 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
317 {
318 return 0;
319 }
320 #endif
321
322 /*
323 * Instantiate the generic non-control parts of the device.
324 */
wm8994_device_init(struct wm8994 * wm8994,int irq)325 static int wm8994_device_init(struct wm8994 *wm8994, int irq)
326 {
327 struct wm8994_pdata *pdata;
328 struct regmap_config *regmap_config;
329 const struct reg_sequence *regmap_patch = NULL;
330 const char *devname;
331 int ret, i, patch_regs = 0;
332 int pulls = 0;
333
334 if (dev_get_platdata(wm8994->dev)) {
335 pdata = dev_get_platdata(wm8994->dev);
336 wm8994->pdata = *pdata;
337 }
338 pdata = &wm8994->pdata;
339
340 ret = wm8994_set_pdata_from_of(wm8994);
341 if (ret != 0)
342 return ret;
343
344 dev_set_drvdata(wm8994->dev, wm8994);
345
346 /* Add the on-chip regulators first for bootstrapping */
347 ret = mfd_add_devices(wm8994->dev, 0,
348 wm8994_regulator_devs,
349 ARRAY_SIZE(wm8994_regulator_devs),
350 NULL, 0, NULL);
351 if (ret != 0) {
352 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
353 goto err;
354 }
355
356 switch (wm8994->type) {
357 case WM1811:
358 wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
359 break;
360 case WM8994:
361 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
362 break;
363 case WM8958:
364 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
365 break;
366 default:
367 BUG();
368 goto err;
369 }
370
371 wm8994->supplies = devm_kzalloc(wm8994->dev,
372 sizeof(struct regulator_bulk_data) *
373 wm8994->num_supplies, GFP_KERNEL);
374 if (!wm8994->supplies) {
375 ret = -ENOMEM;
376 goto err;
377 }
378
379 switch (wm8994->type) {
380 case WM1811:
381 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
382 wm8994->supplies[i].supply = wm1811_main_supplies[i];
383 break;
384 case WM8994:
385 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
386 wm8994->supplies[i].supply = wm8994_main_supplies[i];
387 break;
388 case WM8958:
389 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
390 wm8994->supplies[i].supply = wm8958_main_supplies[i];
391 break;
392 default:
393 BUG();
394 goto err;
395 }
396
397 /*
398 * Can't use devres helper here as some of the supplies are provided by
399 * wm8994->dev's children (regulators) and those regulators are
400 * unregistered by the devres core before the supplies are freed.
401 */
402 ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
403 wm8994->supplies);
404 if (ret != 0) {
405 dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
406 goto err;
407 }
408
409 ret = regulator_bulk_enable(wm8994->num_supplies,
410 wm8994->supplies);
411 if (ret != 0) {
412 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
413 goto err_regulator_free;
414 }
415
416 ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
417 if (ret < 0) {
418 dev_err(wm8994->dev, "Failed to read ID register\n");
419 goto err_enable;
420 }
421 switch (ret) {
422 case 0x1811:
423 devname = "WM1811";
424 if (wm8994->type != WM1811)
425 dev_warn(wm8994->dev, "Device registered as type %d\n",
426 wm8994->type);
427 wm8994->type = WM1811;
428 break;
429 case 0x8994:
430 devname = "WM8994";
431 if (wm8994->type != WM8994)
432 dev_warn(wm8994->dev, "Device registered as type %d\n",
433 wm8994->type);
434 wm8994->type = WM8994;
435 break;
436 case 0x8958:
437 devname = "WM8958";
438 if (wm8994->type != WM8958)
439 dev_warn(wm8994->dev, "Device registered as type %d\n",
440 wm8994->type);
441 wm8994->type = WM8958;
442 break;
443 default:
444 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
445 ret);
446 ret = -EINVAL;
447 goto err_enable;
448 }
449
450 ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
451 if (ret < 0) {
452 dev_err(wm8994->dev, "Failed to read revision register: %d\n",
453 ret);
454 goto err_enable;
455 }
456 wm8994->revision = ret & WM8994_CHIP_REV_MASK;
457 wm8994->cust_id = (ret & WM8994_CUST_ID_MASK) >> WM8994_CUST_ID_SHIFT;
458
459 switch (wm8994->type) {
460 case WM8994:
461 switch (wm8994->revision) {
462 case 0:
463 case 1:
464 dev_warn(wm8994->dev,
465 "revision %c not fully supported\n",
466 'A' + wm8994->revision);
467 break;
468 case 2:
469 case 3:
470 default:
471 regmap_patch = wm8994_revc_patch;
472 patch_regs = ARRAY_SIZE(wm8994_revc_patch);
473 break;
474 }
475 break;
476
477 case WM8958:
478 switch (wm8994->revision) {
479 case 0:
480 regmap_patch = wm8958_reva_patch;
481 patch_regs = ARRAY_SIZE(wm8958_reva_patch);
482 break;
483 default:
484 break;
485 }
486 break;
487
488 case WM1811:
489 /* Revision C did not change the relevant layer */
490 if (wm8994->revision > 1)
491 wm8994->revision++;
492
493 regmap_patch = wm1811_reva_patch;
494 patch_regs = ARRAY_SIZE(wm1811_reva_patch);
495 break;
496
497 default:
498 break;
499 }
500
501 dev_info(wm8994->dev, "%s revision %c CUST_ID %02x\n", devname,
502 'A' + wm8994->revision, wm8994->cust_id);
503
504 switch (wm8994->type) {
505 case WM1811:
506 regmap_config = &wm1811_regmap_config;
507 break;
508 case WM8994:
509 regmap_config = &wm8994_regmap_config;
510 break;
511 case WM8958:
512 regmap_config = &wm8958_regmap_config;
513 break;
514 default:
515 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
516 return -EINVAL;
517 }
518
519 ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
520 if (ret != 0) {
521 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
522 ret);
523 return ret;
524 }
525
526 /* Explicitly put the device into reset in case regulators
527 * don't get disabled in order to ensure we know the device
528 * state.
529 */
530 ret = wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
531 wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
532 if (ret != 0) {
533 dev_err(wm8994->dev, "Failed to reset device: %d\n", ret);
534 return ret;
535 }
536
537 if (regmap_patch) {
538 ret = regmap_register_patch(wm8994->regmap, regmap_patch,
539 patch_regs);
540 if (ret != 0) {
541 dev_err(wm8994->dev, "Failed to register patch: %d\n",
542 ret);
543 goto err;
544 }
545 }
546
547 wm8994->irq_base = pdata->irq_base;
548 wm8994->gpio_base = pdata->gpio_base;
549
550 /* GPIO configuration is only applied if it's non-zero */
551 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
552 if (pdata->gpio_defaults[i]) {
553 wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
554 0xffff, pdata->gpio_defaults[i]);
555 }
556 }
557
558 wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
559
560 if (pdata->spkmode_pu)
561 pulls |= WM8994_SPKMODE_PU;
562
563 /* Disable unneeded pulls */
564 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
565 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
566 WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
567 pulls);
568
569 /* In some system designs where the regulators are not in use,
570 * we can achieve a small reduction in leakage currents by
571 * floating LDO outputs. This bit makes no difference if the
572 * LDOs are enabled, it only affects cases where the LDOs were
573 * in operation and are then disabled.
574 */
575 for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
576 if (wm8994_ldo_in_use(pdata, i))
577 wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
578 WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
579 else
580 wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
581 WM8994_LDO1_DISCH, 0);
582 }
583
584 wm8994_irq_init(wm8994);
585
586 ret = mfd_add_devices(wm8994->dev, -1,
587 wm8994_devs, ARRAY_SIZE(wm8994_devs),
588 NULL, 0, NULL);
589 if (ret != 0) {
590 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
591 goto err_irq;
592 }
593
594 pm_runtime_enable(wm8994->dev);
595 pm_runtime_idle(wm8994->dev);
596
597 return 0;
598
599 err_irq:
600 wm8994_irq_exit(wm8994);
601 err_enable:
602 regulator_bulk_disable(wm8994->num_supplies,
603 wm8994->supplies);
604 err_regulator_free:
605 regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
606 err:
607 mfd_remove_devices(wm8994->dev);
608 return ret;
609 }
610
wm8994_device_exit(struct wm8994 * wm8994)611 static void wm8994_device_exit(struct wm8994 *wm8994)
612 {
613 pm_runtime_disable(wm8994->dev);
614 wm8994_irq_exit(wm8994);
615 regulator_bulk_disable(wm8994->num_supplies,
616 wm8994->supplies);
617 regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
618 mfd_remove_devices(wm8994->dev);
619 }
620
621 static const struct of_device_id wm8994_of_match[] = {
622 { .compatible = "wlf,wm1811", .data = (void *)WM1811 },
623 { .compatible = "wlf,wm8994", .data = (void *)WM8994 },
624 { .compatible = "wlf,wm8958", .data = (void *)WM8958 },
625 { }
626 };
627 MODULE_DEVICE_TABLE(of, wm8994_of_match);
628
wm8994_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)629 static int wm8994_i2c_probe(struct i2c_client *i2c,
630 const struct i2c_device_id *id)
631 {
632 const struct of_device_id *of_id;
633 struct wm8994 *wm8994;
634 int ret;
635
636 wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
637 if (wm8994 == NULL)
638 return -ENOMEM;
639
640 i2c_set_clientdata(i2c, wm8994);
641 wm8994->dev = &i2c->dev;
642 wm8994->irq = i2c->irq;
643
644 if (i2c->dev.of_node) {
645 of_id = of_match_device(wm8994_of_match, &i2c->dev);
646 if (of_id)
647 wm8994->type = (enum wm8994_type)of_id->data;
648 } else {
649 wm8994->type = id->driver_data;
650 }
651
652 wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
653 if (IS_ERR(wm8994->regmap)) {
654 ret = PTR_ERR(wm8994->regmap);
655 dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
656 ret);
657 return ret;
658 }
659
660 return wm8994_device_init(wm8994, i2c->irq);
661 }
662
wm8994_i2c_remove(struct i2c_client * i2c)663 static int wm8994_i2c_remove(struct i2c_client *i2c)
664 {
665 struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
666
667 wm8994_device_exit(wm8994);
668
669 return 0;
670 }
671
672 static const struct i2c_device_id wm8994_i2c_id[] = {
673 { "wm1811", WM1811 },
674 { "wm1811a", WM1811 },
675 { "wm8994", WM8994 },
676 { "wm8958", WM8958 },
677 { }
678 };
679 MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
680
681 static const struct dev_pm_ops wm8994_pm_ops = {
682 SET_RUNTIME_PM_OPS(wm8994_suspend, wm8994_resume, NULL)
683 };
684
685 static struct i2c_driver wm8994_i2c_driver = {
686 .driver = {
687 .name = "wm8994",
688 .pm = &wm8994_pm_ops,
689 .of_match_table = of_match_ptr(wm8994_of_match),
690 },
691 .probe = wm8994_i2c_probe,
692 .remove = wm8994_i2c_remove,
693 .id_table = wm8994_i2c_id,
694 };
695
696 module_i2c_driver(wm8994_i2c_driver);
697
698 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
699 MODULE_LICENSE("GPL");
700 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
701